diff --git a/Gemfile.lock b/Gemfile.lock
index b28f3e52..4a929a22 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -245,7 +245,7 @@ GEM
     psych (3.3.1)
     public_suffix (4.0.6)
     racc (1.6.0)
-    rack (2.2.3)
+    rack (2.2.3.1)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.2.2.1)